US6442268B1 - Method of implementing a line group function in a communications network based on ITU-T H.323 - Google Patents

Method of implementing a line group function in a communications network based on ITU-T H.323 Download PDF

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Publication number
US6442268B1
US6442268B1 US09/469,085 US46908599A US6442268B1 US 6442268 B1 US6442268 B1 US 6442268B1 US 46908599 A US46908599 A US 46908599A US 6442268 B1 US6442268 B1 US 6442268B1
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group
endpoint
proxy function
endpoints
address
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US09/469,085
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Karl Klaghofer
Markku Korpi
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Unify GmbH and Co KG
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Siemens AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/46—Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained
    • H04M3/465—Arrangements for simultaneously calling a number of substations until an answer is obtained
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/46—Arrangements for calling a number of substations in a predetermined sequence until an answer is obtained
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/20—Aspects of automatic or semi-automatic exchanges related to features of supplementary services
    • H04M2203/2044—Group features, e.g. closed user group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
    • H04M3/51—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing
    • H04M3/523—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing with call distribution or queueing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S379/00—Telephonic communications
    • Y10S379/908—Multimedia

Definitions

  • the invention lies in the telecommunications field. More specifically, the invention relates to a method of implementing a line group function in a communications network based on ITU-T Standard H.323.
  • line group signifies that a group address is called from a calling terminal in order to prompt a connection to be set up to one of a plurality of group terminals in a line group.
  • Line group functions are known from centrally controlled communication private branch exchanges.
  • communication private branch exchanges there is a central switching device which undertakes the signaling for the individual group endpoints in a line group and also switches the call set-up for the connections between a group endpoint and a calling endpoint.
  • a central communication controller to the individual group endpoints.
  • three fundamental line group types are distinguished. If a call directed from a calling endpoint to the group address is signaled to all group endpoints simultaneously, then a “pickup” group function is involved. If the incoming call is signaled to a single group endpoint and respectively signaled to the next endpoint if this group endpoint does not respond within a particular time period, a “hunting” group function is involved. If a call directed to a group address is signaled specifically to a group endpoint by the central controller on the basis of an automatic call distribution function, this is called Automatic Call Distribution ACD.
  • the novel method comprises the following method steps:
  • a proxy function as a controller for a line group function ensures that the line group function can be carried out irrespective of the state of the individual group endpoints.
  • the setting-up of connections between endpoints in a communications network based on ITU-T H.323 is controlled by the endpoints. If a terminal at an endpoint is not ready, an attempt to set up a connection to that terminal would have no effect without a proxy function.
  • the proxy function which is independent of terminals, thus ensures that the line group function is implemented even if terminals at individual group endpoints are not ready.
  • a proxy function is a logic function within a communications network.
  • a gatekeeper is a logic function for performing standard functions such as address resolution or bandwidth management.
  • address resolution means that a calling endpoint transmits to the gatekeeper an alias address for an endpoint which is to be called, and receives from the gatekeeper the transport address, that is to say the Internet protocol address and the port number.
  • the gatekeeper knows the volume of traffic for real-time applications within the network area for which it is responsible.
  • the gatekeeper compares the requested bandwidth with the available bandwidth and, depending on the result of the comparison, transmits a message to the calling terminal.
  • a proxy is also a logic function.
  • a proxy according to the invention knows the transport addresses of all the members of a line group for which the proxy can be contacted via a group address, a so-called pilot address. When a call for this group address comes to the proxy, the proxy attempts to set up a connection to one of the line group endpoints on the basis of a stipulated regulation using the transport addresses of the group endpoints of the members of the line group.
  • the proxy function signals to the calling endpoint that a connection setup message is being transmitted to the group endpoints.
  • the proxy function signals to the calling terminal that it is transmitting a connection setup message to a group endpoint. This allows a subscriber at the calling endpoint to recognize that a connection setup operation is not yet complete but has not been terminated either.
  • the proxy function transmits a connection setup message simultaneously to all group endpoints and transmits to the calling endpoint the address of the group endpoint from which the proxy function receives a first response message, which signals readiness to receive.
  • This embodiment of the invention implements a pickup-group line group function.
  • the proxy function transmits a connection setup message to one of the group endpoints and, if no response message (ready to receive) has been transmitted to the proxy function from the one group endpoint within a predetermined time period, the proxy function transmits a connection setup message to another of the group endpoints until one of the group endpoints transmits a response message.
  • This embodiment of the invention allows implementing a hunting-group line group function. The hunting is continued either until one of the group endpoints transmits a response message or until a stipulated maximum time period has expired.
  • Both the method just described for implementing a hunting-group line group function and the previously described method for implementing a pickup-group line group function can also be used to contact, via a single group address, a subscriber who may be contactable via a plurality of different endpoints. In this case, all the group endpoints in the respective line group are allocated to the same subscriber.
  • one of the group endpoints is a message recording device, and the step of transmitting a connection setup message with the proxy function comprises transmitting the connection setup message to the device for recording messages last.
  • one of the group endpoints is allocated a message recording device, and the proxy function transmits a connection setup message to this group endpoint only if all the other group endpoints have not set up a connection.
  • the proxy function defines a sequence in which connection setup messages are to be transmitted to the individual group endpoints on the basis of a regulation for automatic call distribution.
  • the proxy function defines the sequence in which connection setup messages are transmitted to individual group endpoints on the basis of a regulation for automatic call distribution.
  • This regulation can, for example, be designed to optimize the timing of the utilization of the individual group endpoints.
  • the regulation for call distribution can also be based on the instant when a call was last ended.
  • the individual group endpoints can possibly also be contactable via alias addresses which are independent of the group address.
  • the alias address can in this case be resolved by a gatekeeper function, for example. Accordingly, such a gatekeeper function transmits the transport address of the specifically called group endpoint to the calling endpoint.
  • FIG. 1 is a schematic message flowchart for implementing a pickup-group line group in a communications network based on ITU-T Standard H.323 illustrating an embodiment of a method according to the invention
  • FIG. 2 is a schematic message flowchart for implementing a hunting-group line group in a communications network based on ITU-T Standard H.323 illustrating an embodiment of a method according to the invention.
  • FIGS. 1 and 2 each show basic states, events and the message flow between three endpoints A, B and C in a communications network based on ITU-T Standard H.323 and a proxy function provided in this communications network.
  • the proxy function Proxy and non-illustrated terminals that are allocated to the endpoints A, B and C are each in an inactive state.
  • a subscriber at the endpoint A uses the proxy function Proxy to prompt a connection to be set up to a line group of endpoints B and C.
  • Proxy proxy function
  • an RAS message is transmitted from the endpoint A to the gatekeeper responsible for the endpoint A.
  • RAS stands for registration, administration and status and is equivalent to a protocol between the endpoint and the gatekeeper.
  • FIGS. 1 and 2 the corresponding sequence of events is shown in a simplified illustration.
  • the endpoint A sends a request for access authorization in the form of an RAS message AdmissionRequest to the gatekeeper with an alias address for the line group B, C which is to be called.
  • the gatekeeper as a logic function, checks the authorization of the calling endpoint A and transmits an RAS message AdmissionConfirm to the endpoint A to acknowledge access authorization.
  • the endpoint A receives from the gatekeeper an address for the line group to be called in the form of a group transport address for a proxy function Proxy as a routable alias address for this imaginary endpoint.
  • the endpoint A transmits a connection setup message H.225 SETUP containing the group transport address of the line group to be called to the proxy function Proxy.
  • a group transport address for a line group is also called a pilot address.
  • the proxy function Proxy recognizes that it must take the addresses of the actual endpoints B and C from a table assigned to the group transport address in order to send a message H.225 SETUP to these actual endpoints B and C.
  • the message H.225 SETUP is forwarded by the proxy function Proxy to the endpoint B and to the endpoint C simultaneously.
  • the endpoint B and the endpoint C acknowledge to the proxy function Proxy that dialing is complete with a message CallProc, and that an incoming call has been recognized with a message Alerting.
  • the proxy function transmits these messages CallProc and Alerting to the calling endpoint A only once, however, in response to the first corresponding message received.
  • a subscriber or an automated device at the endpoint B wants to take the call signaled by the endpoint A
  • a response message CONNECT (as per ITU-T H.225) is transmitted to the endpoint A from the endpoint B via the proxy function Proxy.
  • a procedure for opening logical channels between the endpoints A and B is then initiated.
  • the opening of logical channels can either be prepared by the actual SETUP message and concluded with the CONNECT message, or can be initiated by the CONNECT message.
  • the bearer channels or logical channels that is to say the channels for transmitting useful information, are opened directly between the endpoints A and B, whereas the signaling connections have all been set up to the proxy function Proxy, and messages are forwarded from this proxy function Proxy to the actual destinations, endpoint A and endpoint B.
  • the message H.225 SETUP is first forwarded to the endpoint B by the proxy function.
  • the endpoint B acknowledges to the proxy function Proxy that dialing is complete with a message CallProc and that an incoming call has been recognized with a message Alerting.
  • the proxy function transmits these messages CallProc and Alerting to the calling endpoint A.
  • the proxy function Proxy releases the signaling connection to the endpoint B with the message release.
  • the proxy function Proxy forwards the message H.225 SETUP to the endpoint C.
  • the endpoint C acknowledges to the proxy function Proxy that dialing is complete with a message CallProc and that an incoming call has been recognized with a message Alerting.
  • the proxy function does not now transmit these messages CallProc and Alerting to the calling endpoint A, as this has already been done previously on account of the corresponding messages from the endpoint B.
  • a subscriber or an automated device at the endpoint C wants to take the call signaled by the endpoint A
  • a response message CONNECT (as per ITU-T H.225) is transmitted to the endpoint A from the endpoint C via the proxy function Proxy.
  • a procedure for opening logical channels between the endpoints A and C is then initiated.
  • the opening of logical channels can either be prepared by the actual SETUP message and concluded with the CONNECT message, or can be initiated by the CONNECT message.
  • the logical channels or bearer channels that is to say the channels for transmitting useful information, are opened directly between the endpoints A and C, whereas the signaling connections have all been set up to the proxy function Proxy, and messages are forwarded from this proxy function Proxy to the actual destinations, endpoint A and endpoint C.
US09/469,085 1998-12-21 1999-12-21 Method of implementing a line group function in a communications network based on ITU-T H.323 Expired - Lifetime US6442268B1 (en)

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EP1014660A3 (de) 2003-12-03
EP1014660A2 (de) 2000-06-28
EP1014660B1 (de) 2006-03-15
AU6535699A (en) 2000-06-22

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